A chimney can leak during rain for several distinct structural and mechanical reasons, most commonly due to a missing or damaged chimney cap that allows water to pour straight down the open flue. Other leading causes include cracked or deteriorated mortar crowns at the top of the chimney, rusted or improperly sealed metal flashing where the chimney structure intersects the roofline, porous masonry bricks absorbing moisture, or cracked clay flue liners. You can troubleshoot chimney leaks safely by inspecting attic spaces and the roof from a safe vantage point during dry weather. You can verify that your corrective action is successful when installing a rain cap, sealing flashing, or waterproofing masonry prevents interior water intrusion during subsequent heavy rainstorms.
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